In ATProto, this is solved by not having "instances". Your data is stored on a personal server (which can ofc go down). However, your identity isn't hard-tied t

In ATProto, this is solved by not having "instances". Your data is stored on a personal server (which can ofc go down). However, your identity isn't hard-tied to that server. If you have a backup (making those more easily available is being worked on by people in the ecosystem), you can restore it on another host and point your identity there instead. So there's one level of indirection which prevents the problem you're describing. Additionally, since ATProto decouples hosting of data from hosting of applications, there is no such things as "instances" having beefs and defederating from each other. The data flows one way (from PDS to apps). Apps may choose to ban certain PDS's but generally PDS's themselves are treated as app-agnostic containers of data. So intra-network social beefs don't translate to technological cutoff or loss of mobility. Social groups and communities are decoupled from hosting.